The
Voltage

Voltage
in open and closed circuits

1)
Voltages in a closed circuit

In a closed circuit, the electric current flows and the voltage is
always:
- Different from zero for the battery or electric generator.
- Different from zero for a lamp, a motor, a resistance or a bypass
diode.
- Zero for a connecting wire or a closed switch.

2)
Voltages in an open circuit

In an open circuit the electric current does not flow and the tension
is always:
- different from zero for a battery or an electric generator.
- Zero across a lamp, a motor, a resistor, a bypass diode or a switch
closed or wire connection.
- Is equal to the Battery's voltage for an open switch or a blocking
diode.
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